SVSR design, manufacture and install a range of vent shafts for different applications, according to different site conditions and odour control requirements. Below is a sample of the most commonly used ventilation shafts and cowls. We also custom design and fabricate to your specifications.
Sydney Water Standard Projects
SVSR supply and install vent shafts for Sydney Water accredited Major and Minor Works Constructors throughout Sydney, Illawarra and the Blue Mountains.
SVSR specialise in manufacture, delivery and installation of Sydney Water Standard vent shafts to any job site.
We can help with your Sydney Water Project by
- Assisting with Project design, Tendering and procurement
- Completion of mandatory Pre-Works Safety, Environmental and Quality Assurance documentation
- manufacturing and delivering vent shafts to site
- Installing vent shafts using SVSR’s modern fleet of cranes, plant and equipment
Our personnel are experienced, licensed and ready to help you meet your Project requirements.
Sydney Water Standard Vent shafts
- Deemed to Comply (DTC) vent shaft – Design Life of 50-60 years in the most extreme corrosive environments. SW Dwg Nos. DTC 2300 and DTC2301 – Manufactured from 316 grade stainless steel
- Post Vent – Drawing No. EPS 700.07. A freestanding structure. Sized at 150, 225 or 300mm in diameter to a maximum of 9 metres in height
- Low-Level Induct vent shaft. Designed to reduce septicity within Sewer Pump Station wet wells and Rising Main discharge man holes. Sydney Water Drawing No. EPS 617.1 – 304 grade stainless steel available with or without protective cover
- Guy-Wire vent shaft –Sydney Water Dwg EPS700.01 – EPS700.06. Manufactured from either 316 or 304 grade stainless steel and available from 10m to 18m in height
- Wall-mounted vent shaft – Ideal vent shaft for medium and high density development and where access is severely limited. Can be off-set around eves and gutters on new buildings. Sized at 150, 225 or 300mm in diameter. Requires double-brickwork or structural concrete over 150mm in thickness
See Downloads for Vent shaft Technical Drawings
Treatment process regarding finishes on Stainless steel products are outlined in Sydney Water July 2015 update. The default finish is now bead blasting: “2.3 Surface Finish – Unless otherwise specified, painting of stainless steel vents is not required. All external stainless steel surfaces shall be bead blasted to achieve a non-directional low reflective uniform matt finish with a surface roughness profile of Ra 3.5 to 4.5 microns. Blast media shall be glass. The blasting media shall be free of contamination including iron and steel. The blasted surface shall then be chemically passivated.”
Councils and Regional Clients (Water Services Association of Australia)
Vent shaft replacement is best option for Public safety and no ongoing maintenance costs. Existing Council ventilation shafts are now in excess of 60 years old and present an urgent safety risk to people and property. Concrete cancer and sewer gases attack the vent shaft and expose the reinforced steel bars, making concrete vent shafts susceptible to lightning strikes, collapse and serious injury.
SVSR specialise in removal and replacement of aging, deteriorating vent shafts for regional Councils and Water Agencies. We offer the following services:
Renewal of existing Vent shafts
SVSR specialise in the replacement of existing reinforced concrete and Mild Steel sewer vent shafts. We have demolished and replaced literally thousands of ventshafts across NSW for numerous Councils and Water Agencies. Vent shaft replacement is the most cost-effective option over the long-term for Infrastructure and Asset owners as it requires NO ONGOING MAINTENANCE COSTS AND NO RISK TO PUBLIC SAFETY.
Manufacturing and Supplying new vent shaft materials for installation by Council.
We manufacture and supply a range of vent shaft parts, delivered ready for installation by Others. All ventilation shafts are constructed using the highest quality materials to maximise design-life longevity and ensure maintenance-free service for years to come.
Inspection and condition reports
With aging sewer assets come odour complaints as hydrogen sulphide, or “rotten egg” gas becomes a major problem. SVSR provide advice and reporting of odour issues within communities, with a focus on developing asset rehabilitation strategies and odour control solutions.
This includes photography of the vent shaft and a location/condition report for each vent stack. This information is provided in digital format for effective asset management, particularly for regional or Council areas.
Regional Council Standard Ventshafts
- Post Vent – Drawing No. EPS 700.07. The most cost-effective vent shaft for low to medium density catchment areas. Sized at 150, 225 or 300mm in diameter to a maximum of 9 metres in height
- SEW-1408 / SCP 1003 – Galvanised Mild Steel vent stack to meet Hunter Water requirements
- Guy-Wire Ventshaft –Sydney Water Dwg EPS700.01 – EPS700.06. Manufactured from either 316 or 304 grade stainless steel and available from 10m to 18m in height
See Downloads link for Vent shaft Technical Drawings.
Vent shaft Cowls
There are 3 types of vent shaft cowling available: wire cowl (non-directional, also known as a bird cage); rotating cowl (also known as a whirly bird, used in educt cowls); and forced induct cowl (has a tail like appendage). We manufacture, supply and install.
Sydney Water Drawing number EPS 700.12. This is a non-directional passive cowling which requires minimal maintenance, also known as a bird cage. Ideal for use where access for ongoing maintenance is severely limited eg. resident’s backyards.
Rotating educt cowl
Drawing no. EPS 700.11. An active cowl designed to extract maximum amounts of corrosive gases from areas where septicity and odour issues are common eg. Pump Station wet wells and Rising Main discharge maintenance holes. Also known as a whirly bird. Rotating cowls create a vacuum to maximise extraction of corrosive and odorous gases from sewer lines and maintenance holes. UV stability to withstand elements.
Rotating induct cowl
Drawing Number EPS 700.11. This type of cowl has a tail like appendage. Designed to allow the cowl opening to always face the on-coming wind. The wind vane fitted to the rear of the cowl ensures the cowl spins to face wind direction, & wind is forced into the vent. These cowls draw oxygen into the sewer, increasing air-flow and thereby reducing septicity, corrosion and concrete cancer. UV stability to withstand elements.
See Engineering & Fabrication for Cowl sizes, material, and weight dimensions.
Engineering and Fabrication
At SVSR we relentlessly strive to achieve maximum value for our clients by selecting the best quality materials for manufacturing. Our design, fabrication and installation processes ensure that the products we provide have maximum asset life and minimal on-going maintenance costs.
All SVSR fabrication processes and products have been extensively tested and deemed suitable for the intended purpose by Sydney Water Corporation (SWC) and the Water Services Association of Australia (WSAA). In addition, SVSR’s strict Quality Control Management System provides our clients with the knowledge that they are dealing with an industry leader using the best products available on today’s market.
Vent shaft Colour and Corrosion Resistance Process
Unless requested by the Client, vent shafts will not be painted but will be provided in raw stainless and galvanised steel.
Treatment process regarding finishes on Stainless steel products are outlined in Sydney Water’s July 2015 Update. The default finish is now bead blasting: “2.3 Surface Finish – Unless otherwise specified, painting of stainless steel vents is not required. All external stainless steel surfaces shall be bead blasted to achieve a non-directional low reflective uniform matt finish with a surface roughness profile of Ra 3.5 to 4.5 microns. Blast media shall be glass. The blasting media shall be free of contamination including iron and steel. The blasted surface shall then be chemically passivated.”
Haphazard manufacturing may inadvertedly cause contamination, damaging the surface of vent shaft. Our material handling equipment has been audited to ensure it’s clean of any ferrous contamination from other uses (specifically, tools, slings, PVC fork lift sleeves, delivery truck cradles, tie down straps etc). Importantly, these material handling guidelines are consistent throughout the life of the material. i.e. from SVSR manufacturing through to installation.
Alternate to Sydney Water specifications and on request, pickling can also produce the required 3.5-4.5 Ra finish; it’s more effective in removing oxides and iron contamination. It selectively removes the least corrosion-resistant areas such as the Cr depleted zones.
Where assets are requested to be painted by our Client, vent shafts are prepared, primed and painted and comply with WSA201 “Manual for the Selection and Application of Protective Coatings”. Epoxy and polyurethane products are primarily used for protection of all stainless steel and galvanised vent materials in accordance with the relevant section of the Standard.
See Downloads link for Vent shaft Technical Drawings
Engineering details for Cowls:
Both induct and educt cowls are fitted with stainless steel shafts and sealed stainless steel bearings to minimise damage from highly corrosive sewer gases and reduce the asset owner’s ongoing maintenance costs. They come in most popular colours.
- Wire cowl – Sydney Water Drawing number EPS 700.12. Materials: Stainless steel. Finish: Primed and painted in any colour you choose. Dimensions: Available in sizes 150, 225 & 300mm. Spot welded at all intersections
- Rotating cowl – Varying sizes of Rotating Educt Cowls – Drawing no. EPS 700.11. Materials: Turbine & Flue-Aluminium grade 5005 H34. Bearings: Steel NSK BFW30 Bearing Deflector Flange-Aluminium grade. Rivets: Stainless steel STST grade 302. Screws & Nuts: 304 or 316 stainless steel. Shafts & Brackets: 303 or 304 stainless steel. Bearing Holder: Glass filled nylon. Finish: Powder coated inside & out with polyester powder. Weight: 5kgs. Tolerances: Size +/- 2mm, Weight +/- 0.2kg
- Forced induct cowl – Varying sizes of Rotating Induct Cowls – Drawing Number EPS 700.11. Materials: Bearing Deflector Flange-Aluminium grade. Rivets: Stainless steel STST grade 302. Screws & Nuts: 304 or 316 stainless steel. Shafts & Brackets: 303 or 304 stainless steel. Bearing Holder: Glass Filled nylon. Finish: Powder coated inside & out with polyester powder
- Weight: 5kgs. Tolerances: Size +/- 2mm, Weight +/- 0.2kg. Dimensions: Model 150 Weight 1.9kg, Inner 150mm Outer 580mm. Model 225 Weight 2.8kg, Inner 235mm Outer 725mm. Model 300 Weight 3.7kg, Inner 308mm Outer 850mm
SVSR specialise in on-site works involving Installation of sewer vent shafts. We use our fleet of cranes and trucks and offer the following services:
Renewal of existing vent shafts
SVSR specialise in the replacement of existing reinforced concrete sewer vent shafts. We have demolished and replaced literally thousands of vent shafts across NSW for Councils, Sydney Water and other Water Agencies. Vent shaft replacement is the most cost-effective option over the long-term for infrastructure and Asset owners as vent shafts require little or no ongoing maintenance.
Installation of new vent stacks
For urban development Projects or “Greenfields” Estates, SVSR can assist with Design and Construction of new wastewater assets, including vent shafts. Building and delivering vent shafts to your requirements is our core business, whether for installation by Others or installation by SVSR team.
Demolition and Relocation to alternate site
Relocating existing infrastructure is an important part of the development process. SVSR can advise on asset location requirements, carry out Project Co-Ordination as well as conduct all on-site Works to ensure important assets are protected whilst meeting community, water agency and developers requirements.
Our Fleet INCLUDES:
- 4 Tonne Maeda Mobile Crawler Crane (SWL 3.8 Tonne)
- 3 Tonne Maeda Mobile Crawler Crane (SWL 2.9 Tonne)
- Isuzu delivery Truck with 8m wheel-base
- Isuzu Work-Truck (13 Tonne GVM) with Hiab fitted
At SVSR, we’re serious about being an Industry Leader. Our commitment represents a complex, continually changing process where regulated, self-regulated and voluntary compliance is expected and encouraged from all our personnel. While we realise that no system is perfect, we are continually striving for improvements and to be the best in the Industry. This goal is built into all our day-to-day operations and everything we do.
We believe that accreditation of our WHS, QA and Environmental Management Systems provides you confidence knowing that your next Project is in safe hands.
Work Health and Safety Compliance Management Systems
Building and installing vent shafts is high-risk work. Safety is our Number 1 priority.
All projects are pre-planned and include submission of a detailed Safe Work Method Statement (SWMS), submitted to Client and any interested stakeholders prior to Works commencing on-site.
Our staff have the following Licenses:
- WorkCover Approved Site Safety Supervisors
- Bonded Asbestos Removal and Demolition Licences, issued by WorkCover NSW
- Crane Operator Licenses (C6) and Dogging Licenses (DG)
- Truck Licenses (MR and HR)
- Work Safely at heights (EWP)
- Work with Confined Spaces (CSE)
- Excavation and Work near underground services
- Concreting and Erection of Formwork and scaffold
Our quality performance is built on our years of experience on the work shop floor and on Site.
At SVSR we relentlessly strive to achieve maximum value for our Clients by selecting the best quality materials for manufacturing. Our design, manufacture and installation processes ensure that the products we provide have maximum asset life and minimal on-going maintenance costs.
All SVSR manufacturing processes and products used have been extensively tested and deemed suitable for the intended purpose by Sydney Water Corporation (SWC) and the Water Services Association of Australia (WSAA). In addition, SVSR’s strict Quality Control Management System provides our Client’s with the knowledge that they are dealing with an industry leader using the best product’s available on today’s market.
At SVSR we are committed to minimising the negative effects of our Work on the community and the natural environment.
Since the majority of vent shafts are located on private property and in resident’s front and backyards, our first priority is to communicate with property owners to keep them updated on the Project. We also liaise with other interested stakeholders including neighbours, local councils, government organizations, developers and private businesses.
A typical vent shaft Project includes:
- Inspection and assessment of the sewer vent shaft including liaising with residents on the likely impact to them (eg. Noise, dust, traffic etc.)
- Recommendations for the most appropriate course of action and organising all approvals and access to the Site
- On completing the Works, addressing any issues that may have arisen
We are committed to developing and maintaining positive, effective relationships with customers, local communities and other key stakeholders. Our primary objective is to provide customers with updated information and a high standard of service. As a company, we value integrity and professionalism.
Our staff take a personal approach to dealing with customers; being professional and courteous. We observe agreed working hours and special conditions relating to working at particular problematic sites.
Where the work has a high impact to the wider community, a site specific Contractor Community Liaison Plan will be developed for each site. We build community needs into the project plans to allow sufficient timeframes for the delivery of communications.
The Natural Environment
We have carried out numerous projects in National Parks, urban bushland, areas adjacent to natural waterways, areas containing threatened flora and fauna, Aboriginal/European heritage sites and areas with acid sulfate soil issues.
Our Environmental Management System (EMS) meets the requirements of AS/ISO 14001 and we have prepared numerous Construction Environmental Management Plans (CEMP) for Government and Private industry.
Supply & repair of sewer vent shafts (SVS) may require the removal of vegetation and may produce small amounts of dust, noise or emissions in areas of environmental sensitivity.
A Site Assessment Checklist captures any environmental sensitivities and Ecologically Endangered Communities (EEC) at the site. Our Project Manager works with a specialist Environmental Scientist to identify any hazards or risks to the area and establishes processes for minimising or removing those risks.
Sensitive environments have additional site-specific environmental impact assessment before work commences. Following the completion of work, SVSR will leave the site in, or rehabilitate the site to the same or similar condition as it was prior to undertaking work.
North West Growth Centre
Commencing in May 2013, SVSR supplied over 75 vent shafts to Pump Stations, Rising Mains and Gravity Sewers which enabled the connection of thousands of new homes in the North-West area of Sydney.
- Approximately 10,000 hectares across the Hills, Blacktown and Hawkesbury local
- Capacity for 70,000 new dwellings and 200,000 people
- 16 Precincts, including three dedicated employment Precincts
- Seven Precincts rezoned already + a further four undergoing Precinct Planning
- Designed around the major centre of Rouse Hill
(see map – image won’t copy onto this page)
South West Growth Centre
Commencing in January 2014, SVSR supplied 35 new vent shafts to thousands of new homes in the South – West area of Sydney.
- Approximately 17,000 hectares across the Liverpool, Camden and Campbelltown local government areas
- Capacity for 110,000 new dwellings and 300,000 people
- 18 Precincts, including two dedicated employment Precincts
- Three Precincts rezoned already + four and a half undergoing Precinct Planning
- Designed around the planned major centre of Leppington
IKEA, Tempe, NSW
SVSR manufactured and installed 52 new gas vents for IKEA’s flagship store located in the Sydney suburb of Tempe.
The project involved bulk earthworks on the site measuring over 60,000m2. Project duration was 18 months in total.
SVSR’s gas vents were designed to mitigate methane build-up from the ex- contaminated landfill Site and included the installation of forced ventilation fans and a 5m deep trench to prevent subsidence and allow the safe release of dangerous gases.
East Street, Wingecarribee
Wingecarribee Council Covers the areas of the Southern Highlands approximately 100km south-west of Sydney. Council is responsible for a large amount of Sewer and Water services and associated pipelines which are well beyond their design life. Many houses and businesses in the area have on-site sewage treatment systems (which Council are not responsible for), which feed into Council’s sewage reticulation system for eventual treatment at Council’s Sewage Treatment Plant (STP).
THE SPECIFIC PROBLEM:
One such example is in the town of Robertson, where a number of residential onsite sewage treatment systems are being transported via a long, undulating sewer rising / pressure Main which feeds into a maintenance hole (MH) at East St, Robertson. Council believe that the sewer is going septic long before it gets to this particular MH.
Council engaged SVSR to install a vent stack to address the odour complaint they were getting from a nearby resident, who complained of a typical “rotten egg” smell (this is typical of H2S gas or hydrogen sulphide).
Initial H2S readings from within the MH were a peak of 200ppm from 10am to 8pm. This is well above acceptable legal limits and is extremely hazardous. It may also lead to corrosive sulfuric acid corrosion or “gas attack” of concrete and steel underground assets.
THE APPROACH TO SOLVING THE PROBLEM
SVSR’s approach was to collect specific data for the site and to be guided by relevant approved Engineered Drawings. The approved Sydney Water Vent shaft Drawing which is appropriate for this location is shown below. Since very little specific data is available for the site, SVSR focussed on approved design principles.
These basic principles are:
- Pressure equalisation – An atmospheric air intake or “induct vent” Induct vent with a flexible opening will act as an anti-vacuum valve and allow for atmospheric air to enter the MH when there is a reduction of pressure in the system.
- Air replacement within the MH – The above induct vent allows for ambient air to enter the sewer maintenance hole. The mixed septic gas / ambient air is then removed from the MH with a high-level extraction vent, known as an “Educt vent”. The gas / air mix is vented to atmosphere by the Educt vent and further diluted with ambient air above the vent pipe. Air replacements are typically calculated according to the number of air replacements achieved per hour for any given area (in this case a sewer MH).
- Educt extraction rates – Educt vents allow for the release of gases within the MH caused by pressure surges when the pressure main discharges liquid / gas sewage into the MH.
- In order for the Educt vent to function effectively, minimum flow velocities must be achieved at the top of the vent pipe.
SVSR installed a 9m x DN300mm Educt vent stack fabricated from 316 Grade stainless steel. The stack was fitted with a wind-driven ‘whirly bird’ cowl to further extract gases and a DN150mm ground level Induct vent to allow air to enter the MH (not visible in photo). This MH is only 1.2m deep (i.e. has a small volume / area).
NB – The Induct and Educt PVC connections were installed by Council. They are incorrectly placed in accordance with the Sydney Water design drawings shown above.
The odour complaints didn’t cease after SVSR had installed the system, so another H2S sample was taken from within the MH. This reading showed that the H2S was down to 80ppm, which is still unacceptably high, especially in a residential area.Further on- site investigation found that the Induct pipe was not closing properly and the odour was evident even at ground level.
The decision was made to:
- Seal the Induct line as it was the likely source of gas leaks and odour generation.
- Install approximately 5kg of activated carbon at 1.5m above ground level, inside the larger Educt vent.
Council personnel have reported that no further odour complaints have been received from nearby residents. They have verbally suggested aggressive corrosion is beginning to become evident on the concrete walls of the aging MH, though this has not been confirmed by SVSR.
SVSR have received approval from Council to establish any testing instrumentation at the MH site to further monitor the problem and/or develop new technologies which may be of assistance.
Given that odour levels are peaking during daylight hours, SVSR are actively pursuing the option of a solar-based solution eg. A solar extraction fan to replace the passive ‘whirly-bird’ or an induced air blower into the MH to dilute the concentrations of septic gases within the MH.
Contact our prompt, friendly and efficient staff today to arrange a free, no obligation quote on your next project.